Thomas o



(No Model.)

T. G. HALL.

VISE.

Patented Feb. 3, 1885.

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THOMAS G. HALL, OF BROOKLYN, NEW YORK.

VISE.

SPECIFICATION forming part of Letters Patent No. 311,487, dated February3, 1885.

Application filed March 26, 1884. (No model.)

1' ztZZ whom it may concern.-

Be it known that I, THOMAS G. HALL, residing in the city of Brooklyn,county of Kings, and State of New York, have invented certain new anduseful Improvements in Vises, of which the following is a description insuch full, clear, concise, and exact terms as will enable any oneskilled in the art to which myin vention belongs to make and use thesame,reference being had to the accompanying drawings, making part ofthis specification, and to the letters and figures of reference markedthereon, in which v Figure 1 represents a side View of my invention,Fig. 2 a front view, and Fig. 3 a detail part of the same inperspective.

Similar letters of reference indicate corresponding parts in all thefigures.

My present invention consists in certain improvements upon a vise forwhich Letters Patent of the United States have been heretofore grantedto me, dated September 16, 1879, and

' numbered 219,719.

Referring to the annexed drawings, 1) b are the limbs of a vise pivotedtogether at k, and governed in their movements by the V-shaped spring 9,the screw-threaded boltd,and thumbscrew 0. The upper ends of these limbs12 b are formed into longitudinal ribs tapped to receive the screws 1;2', which form pivots, upon which the adjustable vise-jaws f f turn,said jaws being formed with external ears tapped to receive thescrew-pivots i t, and with lon gitudinal groovesto correspond with andnicely lit the aforesaid ribs upon the ends of the limbs. Theseparts-with the exceptions hereinafter specified-are formed and combinedsubstantially as illustrated in the drawings, and de scribed in thespecification of the patent above named, to which reference is made forafuller description of the same and their operation. In my presentinvention, however, instead of arranging the thumbscrew e to beardirectly upon the side of the limb b, as shown in said patent, Ihaveinserted between these parts the thimble or washer Z, having preferablya rounded inner end, restingin a corresponding groove cut around theorifice in the limb I), through which the bolt dprotrudes, said surfacesoperating to keep the washer or thimble always centered, and thusprevent contact and binding on the bolt cl, This washer,which is free torevolve, furnishes even hearings on all sides limbs b b may stand withreference to each other, diminishes the friction between the parts,sustains the wear which would otherwise fall on the limb b, and can bereadily re placed when worn out. The rim of the head of the bolt dis cutto receive the set-screwy, to prevent its turning on its axis while thethumbscrew 0 is being screwed up or down. Theinner surface of the headof the bolt dis curved and rests in a correspondingly-shaped seat boredin the limb b, so that at whatever angle the bolt (2 may stand withrelation to the limb b, a full bearing-surface between the said limb andthe head of the bolt will be maintained. The set-screw j does notinterfere with this limited play of the bolt, while it prevents itsturning on its axis. The-perforations in the limbs of the vise throughwhich the bolt (1 passes are funnel'shaped to permit such lateralmovement of the bolt.

If desired, the adjustable jaws may be pro vided with a spring (notshown in the drawings) to keep their upper edges normally pressed back.

Fig. 3 is a perspectivedrawing illustrating the form of the lower endsof the limbs b b where they are pivoted together. The metal of each limbat the lower end is bored out to form the circular disk 0, with the rimm surrounding one side. The two limbs are made counterparts, and fitaccurately in each other, the edge of one disk bearing on the internalcircumference of the rim m of the opposite limb. They are pivotedtogether by the bolt k, screw-threaded, and provided with the not 0, asshown. The effect of shaping the limbs of the vise in this manner is togive great strength and stiffness to the entire device.

The disks and rims above described sustain the greater part of thestrain and friction,which would otherwise fall upon the pivot k, and addgreatly to the efficiency of the device.

Instead of a single piece of metal riveted to one limb and bearingagainst the other, operating as a spring to press the limbs apart,(shown in the former patent referred to,) [prefer to use a V-shapedspring set in notches cut on the inside of the limbs b and b, as illustrated in the drawings.

Having thus described my invention, I claim and desire to secure byLetters Patent the folgroove in one of said jaws, and said jaws beinglowing: pierced with funnel-shaped perforations, sub- 1. 1n a vise, thelimbs b b, pivotedtogether stantially as and for the purpose set forth.I 5

and formed with bearing-surfaces c c and rims 3. In a vise, the limbs 12b, pivoted together 5 m m, being counterparts of each other at the andformed with bearing-surfaces c c and rims points of juncture,substantially as described, at m, combined with a V-shaped spring heldfor the purpose specified. loosely in notches cut in said limbs,substan- 2. In a Vise, the combination of limbs 21 b, tially asdescribed. bolt d, with its attendant parts for operating THOMAS G.HALL. to the jaws of the vise, and set-screw j, said bolt Witnesses:

having a head formed with curved interior SAMUEL LEOPOLD, surface seatedin a correspondingly-shaped CHAS. T. YOUNG.

